You can export as files whether it's CSV, XLSX or PDF to your computer so you can make your own backups. Here are some exporter that available for Plus users:
You can download all the data as Excel files. Or CSV for essential data.
For Orders (B-View) you need to select a form first before download buttons are shown.
The for this (B-View) mode, the order quantity is itemized and grouped by date.
On Customers page is showing all your customers data.